| Radon and thoron in cave dwellings (Yan'an, China). | |
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MedLine Citation:
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PMID: 10749527 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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222Rn and 220Rn concentrations were measured in cave dwellings and brick houses in the region of Yan'an (China) during summer 1997. The underground dwellings are built into Quaternary loess, and all investigated houses are founded on it. The median values of indoor 222Rn and 220Rn concentrations are 42 (n = 18) and 77 Bq m(-3) (n = 15) for brick houses and 92 (n = 23) and 215 (n = 17) Bq m(-3) for cave dwellings. To classify the dwellings in respect to their "cave-character," the fraction of walls having a direct contact to the loses is calculated for each dwelling. While the 222Rn concentrations are increasing with higher fractions, the 220Rn concentrations are not correlated with this fraction. On the other hand, due to the short half-life of 220Rn the distance from the measuring point to the walls is negatively correlated with the 220Rn concentration, while there is no correlation with the 222Rn concentration. Therefore, concentric isolines of 220Rn concentrations showing a strong gradient were detected in cave dwellings. An influence of the ventilation rate is distinct for 222Rn but weak for 220Rn. The effective dose rates for 222Rn and 220Rn and their progenies are calculated for brick houses (2.7 mSv y(-1)), cave dwellings (7.1 mSv y(-1)), and for traditional cave dwellings with a bed foundation built with loess (16.7 mSv y(-1)). These calculations are based on summer measurements only. It is expected that the true effective dose rates will be significantly higher. |
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Authors:
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J Wiegand; S Feige; X Quingling; U Schreiber; K Wieditz; C Wittmann; L Xiarong |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Health physics Volume: 78 ISSN: 0017-9078 ISO Abbreviation: Health Phys Publication Date: 2000 Apr |
Date Detail:
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Created Date: 2000-05-24 Completed Date: 2000-05-24 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 2985093R Medline TA: Health Phys Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 438-44 Citation Subset: IM |
Affiliation:
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University of Essen, Department 9-Geology, Germany. jens.wiegand@uni-essen.de |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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China Housing* Osmolar Concentration Radiometry Radon / analysis* Radon Daughters / analysis Soil Pollutants, Radioactive / analysis |
| Chemical | |
Reg. No./Substance:
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0/Radon Daughters; 0/Soil Pollutants, Radioactive; 10043-92-2/Radon |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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